Pokémon Crystal Tips

Raiku & Entei
Don't listen to the thing about 'you are wasting your time looking for the legendary dogs' instead, when you get the masterball, go & find a legendary dog & use your m-ball (or save it for ho-oh) the other 1 is difficult, you'll spend ages, so bring a high level golbat that knows mean look, use mean look(if you have no golbat then put it to sleep)weaken it, put it to sleep, lob ultra balls at it until the cows come home, when it wakes up & flees, look again util you catch it!
note: don't fly to get to it, plan stratigic routes.